package codequity.one;

public class Client19 {
    public static void main(String[] args) {
        String encode = StringUtils.encode("12");
        System.out.println(encode);

    }


}

//字符串处理工具类
class StringUtils {
    public static String encode(String str) {
        assert str != null : "加密的字符串为null";
        return str;
    }
}
